Assessing the transport and fate of MTBE
amended petroleum hydrocarbons in the UK Chalk aquifer
G P Wealthall, S F Thornton and D N Lerner
Groundwater Protection and Restoration Group, University of Sheffield, UK
www.sheffield.ac.uk/gprg
Fracture Network Characteristics
The fracture system was characterised using combined core logging and down-hole acoustic and optical televiewer imaging.
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Bedding-parallel fractures with a dominant ENE-WSW strike and dip of 2-29° to the SSE and a subordinate bedding-parallel fracture set with E-W strike and N dip of 10-30°
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High-angled fractures include sets with a ENE-WSW or E-W trend and NNW dip of 30 to 80°, and sets with a NW-SE trend and NE dip of 35-75°
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Mean fracture spacing for combined bedding-parallel and high-angled fractures is 0.23 m
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Fracture porosity is estimated as 1.1% and is similar to estimates from other studies
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